DE8781 and DE7872 - CML Microcircuits

CML Microcircuits
COMMUNICATION SEMICONDUCTORS
UM8780/3 November 2003
DE8781/DE8782
User Manual
Advance Information
Features
• CMX878-based modem Reference Design
• ‘AT’ Command Compatible Firmware
• Line Powered
• Opto-isolated Serial Port
• Transformer-less DAA
• Supplied with PCB Layout Data
• FCC68 or TBR21 versions
• On-board FLASH PIC Microcontroller
1
Brief Description
The DE878x Demonstration Board is a reference design and evaluation tool for the CMX878 V.22bis
modem plus DAA IC. Transformer-less DAA, line power extraction and ring detection circuits are
implemented on-board in accordance with CMX878 data sheet recommendations. An RJ11 line
connector is included. The DE8781 is designed for use in U.S. (FCC68) and the DE8782 is designed for
use in Europe (TBR21).
Additionally, a Flash PIC Microcontroller is included with evaluation firmware. There is an opto-isolated
serial link with a 9-pin D-type socket for PC serial communications. The opto-isolators provide a safety
barrier between the line side and a PC. ‘AT’ Commands are used to control the demonstration board via
a standard terminal emulator program running on a host PC.
Although line powered, the board can be re-configured to enable it to be powered locally from a battery or
isolated power supply. The PIC can be re-programmed in situ, via connector, J6, which provides the
necessary connections to proprietary programming tools (not supplied).
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CMX878 Reference Design and Demonstration Board
DE8781/DE8782
CONTENTS
Section
Page
1
Brief Description.................................................................................. 1
2.
Preliminary Information ...................................................................... 4
2.1
Laboratory Equipment............................................................ 4
2.2
Handling Precautions ............................................................. 4
2.3
Approvals ................................................................................ 4
3.
Quick Start ........................................................................................... 5
3.1
Setting-Up................................................................................ 5
3.2
Adjustments ............................................................................ 5
3.3
Operation................................................................................. 6
4.
Signal Lists .......................................................................................... 8
5.
Circuit Schematics and Board Layouts............................................ 10
6.
Detailed Description .......................................................................... 12
6.1
Hardware Description ........................................................... 12
6.2
Firmware Description............................................................ 13
6.3
Software Description ............................................................ 26
6.4
Additional Information.......................................................... 27
6.5
Example Modem Tests.......................................................... 29
6.6
Troubleshooting ................................................................... 30
7.
Performance Specification................................................................ 31
7.1
Electrical Performance.......................................................... 31
Note: This product is in development: Changes and additions will be made to this
specification. Items marked TBD or left blank will be included in later issues.
Information in this data sheet should not be relied upon for final product design.
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CMX878 Reference Design and Demonstration Board
DE8781/DE8782
J5
IBM-PC
RS232 Cable
DE878x
J1
PSTN
Simulator
Reference
Modem
Figure 1 Demonstration Setup Diagram
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2.
Preliminary Information
2.1
Laboratory Equipment
DE8781/DE8782
The following laboratory equipment is needed to use either of these demonstration kits:
PSTN simulator and reference modem.
A PC equipped with a serial port running a terminal emulation program,
such as Microsoft’s Hyperterminal.
2.2
Handling Precautions
Like most demonstration and evaluation kits, this product is designed for use in office and
laboratory environments. The following practices will help ensure its proper operation.
2.2.1
Static Protection
This product uses low power CMOS circuits which can be damaged by electrostatic discharge.
Partially damaged circuits can function erroneously, leading to misleading results. Observe ESD
precautions at all times when handling this product.
2.2.2
Contents - Unpacking
Please ensure that you have received all of the items on the separate information sheet
(EK8780) and notify CML within 7 working days if the delivery is incomplete.
2.3
Approvals
The DE8781 is designed to meet FCC68 telecom approval requirements and the DE8782 is
designed to meet TBR21 telecom approval requirements. Users are advised to observe
local statutory requirements which may apply to this product before direct or indirect
connection to any public telecommunication system.
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3.
DE8781/DE8782
Quick Start
This section provides instructions for users who wish to experiment immediately with the
demonstration kit. A fuller description of the kit and its use appears later in this document.
3.1
Setting-Up
•
Ensure jumpers are in the correct position for line powered operation:-
Jumper
JP1
JP2
•
•
•
•
•
Purpose
Select regulator feed
Select VDD source
# of Pins
3
3
Connected Pins
2 to 3
1 to 2
Open Pins
1
3
Connect J3 pins 15 and 16 with a shorting link (to ensure the DE878x goes into standby
mode when a call is cleared).
Connect 9-pin D-type connector to PC serial port.
Start terminal emulation program and set to 4800 Baud, 8 data bits, no parity, 1 stop bit,
RTS/CTS handshake.
Connect simulated POTS line to RJ11 connector, J1.
The board will momentarily draw current from the line, initialise itself, send a message to
the terminal emulation window and power down.
WARNING – Ground Connections
Care must be taken when using laboratory instruments with the DE878x to ensure that
two electrically separate points on the board are not connected to a common point
externally. In particular, a short between tip or ring and DVSS or AVSS will alter the AC and
DC impedances presented at tip and ring. In the case of the TBR21 version this could lead
to permanent damage to the gyrator circuit.
The nature of the DE878x line interface and power supply options require that for correct
operation the positive supply and board common voltages lie between the tip and ring voltages,
so no two of them may be connected to the same point. The exception to this is the RS232
interface, which is optically isolated from the rest of the DE878x circuitry.
Recommendation: In the laboratory, use only isolated power supplies with the DE878x to allow
the DE878x to electrically ‘float’. This will allow attachment of an oscilloscope ground lead to
one DE878x node. If power is to be supplied from a PSTN simulator, ensure that is it not
referenced to ground (some exchange ‘batteries’ are connected to ground and provide a -50V
supply referenced to ground). If the PSTN simulator has a ground connection, then all laboratory
equipment (including oscilloscopes) must be allowed to ‘float’.
3.2
Adjustments
If a jumper across connector J3, pins 15 and 16, is fitted (default) then start-up is as described
above. If removed, then, after connecting to the line the DE878x will remain powered up but onhook. This is a non-compliant condition as approximately 2.5mA is drawn from the line, but it
allows control of the DE878x including CMX878 registers for evaluation purposes. Additionally,
with this jumper removed, whenever the DE878x goes on-hook the regulator will remain powered
up.
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3.3
DE8781/DE8782
Operation
The DE878x demonstration board allows the user to perform calling, answering and simple data
transfer with a suitable simulator or external third party modem (not supplied). Before a call can
be established the DE878x must be woken up. The default settings allow the DE878x to be
woken up in one of two ways:•
After two ringing bursts have been detected, the DE878x will wake up, go off-hook and
attempt to establish a V.22bis connection.
•
Taking DTR from the in-active to active state (if using hyperterminal, from the ‘Call’
menu, a ‘disconnect’, followed by ‘connect’ operation will achieve this) will wake up the
DE878x. The board will then be off hook and the serial link to a PC active.
When powered-up the DE878x can be controlled by the AT command set described in Section
6.4, from a terminal emulator program on the host PC. An on-board, line-powered PIC
µController interprets the AT command set and controls the CMX878 modem IC.
A suitable emulator is the ‘HyperTerminal’ program, which operates under Windows 95/98/NT
systems. The DE878x AT command set consists of Basic and CML Specific commands.
The board has two operating modes:
AT Command Mode
In this mode the µController firmware is constantly checking to see if the user has typed a valid
AT command. When a valid command is received the firmware will execute that command.
While the firmware is operating in this mode, the user can instruct it to manually answer a call,
originate a call, go on/off hook, read/write to S-registers, issue CML specific AT commands, and
perform any number of other AT command functions.
The DE878x always starts in AT Command mode after being woken up and when board
initialisation is complete.
The CML specific AT commands allow the user to directly control the CMX878 device for
evaluation purposes. Note, customer modified CMX878 device registers will be overwritten when
Dial and Answer AT commands are executed.
The Dial and Answer commands will execute the relevant DTMF transmit, call progress tone
detection and negotiation (handshaking) firmware routines before a connection to a remote
modem/simulator can be established. Negotiation may be aborted by pushing any key.
Note, if the S0 register is set to a non-zero value (default is 2) during this operating mode, the
CMX878 status register will be polled every 20ms to check for ring detect status. If valid ringing
is detected the DE878x will automatically answer a call after n ring cycles, where n is equivalent
to the contents of the S0 register.
Data Transfer Mode
After gaining a connection (i.e. successful negotiation) with a remote modem the DE878x will be
operating in data transfer mode. In this mode the board will transmit all the data it receives from
the RS232 computer terminal to the remote modem via the 2-wire line. Likewise any data
received from the remote modem via the 2-wire line will be sent to RS232 computer terminal.
Whilst operating in this mode the data stream from the RS232 computer terminal is monitored for
the escape code sequence (+++). If this sequence is encountered during data transfer the
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DE8781/DE8782
firmware will revert to on-line AT command mode. Whilst in on-line, AT command mode, the
board to remote modem connection may be aborted by typing ATH0 (instructs modem to go onhook). Alternatively the user can enter relevant AT commands or return to data transfer mode by
using the ATO command. Note that if J3 pins 15 to 16 are s/c (default) the DE878x will go to the
standby condition after an ATH0 is executed.
Loss of carrier from the remote modem will cause the DE878x to hang up and, if J3 pins 15 to 16
are s/c (default), power down.
General
The modem line speed is lower than the speed of the RS232 interface (RS232 is running at
4800bps) and the DE878x firmware only provides a small amount of data buffering. Therefore to
prevent the µController’s data buffer from overflowing the data flow from the RS232 interface to
the µController is controlled by the RTS/CTS (Request/Clear to Send) hardware handshake lines.
The CMX878 settings used during negotiation and data transfer will be based on the contents of
the S-registers when the call was originated or answered. The S-registers are described in
Section 6.4. Certain S-register settings (relevant to the CMX878 configuration), modified during
on-line AT command mode, will only take effect when a new call is originated or answered. For
example, new CMX878 Tx gain settings (S25 register) modified in on-line AT command mode
will be ignored until the next call.
The DE878x is also pre-programmed to demonstrate other functions, such as Line-In-Use
detection, Caller Line Identification, Parallel Phone detection and special functions to facilitate
certification to telecommunication standards. Full details of these are provided in the detailed
description of Section 6.
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4.
DE8781/DE8782
Signal Lists
CONNECTOR PINOUT
Connector
Ref.
Connector
Pin No.
J1
1, 2
Signal
Name
Signal
Type
-
-
J3
J4
A
BI
Bi-directional 2-wire line (A=TIP)
4
B
BI
Bi-directional 2-wire line (B=RING)
-
-
No connection needed
1
VLCL
Power
2
AVDD
Power
1,2
DVDD
Power
Expansion header
3
RA0
I/O
spare
4
RA1
I/O
spare
5
RA2
I/O
spare
6
RA3
I/O
spare
7
RB1
I/O
spare
8
RA4
I/O
spare
10
RB2
I/O
spare
12
RC1
I/O
spare
14
RC0
I/O
spare
16
BOOT-PWR
input
Remain powered after boot-up
9,11,13,15
DVSS
Power
1
GPOP1
Output
2
GPOP2
Output
3
GPOP3
Output
4,5
J5
No connection needed
3
5, 6
J2
Description
-
Local power supply option
CMX878 general purpose outputs
Not connected
1
DCD
Output
9-pin D Type connector – PC DCD
2
TXD
Output
9-pin D Type connector – PC TXD
3
RXD
Input
9-pin D Type connector – PC RXD
4
DTR
Input
9-pin D Type connector – PC DTR
5
HOST-GND
Power
9-pin D Type connector – PC GND
6
DSR
Output
9-pin D Type connector - PC DSR
7
RTS
Input
9-pin D Type connector – PC RTS
8
CTS
Output
9-pin D Type connector - PC CTS
9
RI
Output
9-pin D Type connector – PC RI
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DE8781/DE8782
CONNECTOR PINOUT
Connector
Ref.
Connector
Pin No.
Signal
Name
Signal
Type
J6
1
MCLR
Input
PIC MCLR
2
CTSN
Input
PIC programming data
3
TXD
Input
PIC programming clock
4
VPP
Power
PIC programming voltage
5
DVss
Power
Vss connection
Description
TEST POINTS
Test Point
Ref.
Default
Measurement
Description
TP1, TP2
0V
AVss
TP3, TP4
0V
AVss
JUMPERS
Link
Ref.
JP1
Positions
1-2: local power
Description
Regulator power source
2-3: line power [default]
JP2
1-2: regulator power [default]
AVDD power source
2-3: local power
JP4
1-2: Not used
Host link operating mode
2-3: Normal [hard-wired]
Notes: I/P =
O/P =
BI
=
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Input
Output
Bi-directional
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CMX878 Reference Design and Demonstration Board
5.
DE8781/DE8782
Circuit Schematics and Board Layouts
For clarity circuit schematics are available as separate, high resolution, files.
J2
J5
J1
D32
D29
D28
VLCL AVSS
R62
D26
D30
R60
U5
C16
Q5
C22
+
+
D1 C12 R26
R19 R20
R13
R14
D2
R28
R59
U3R55
R52
C31
R54
R29
Q6
R16
R17
R25
D8
R23
C15
M2
C3
R21
C11
C17
R66
R6
R7
C18
JP1
R89
R90
X1
M1A U1
M1
R5A
R1
R5 R86
R10
R9
R4
R3 R11 Q2
Q1
JP2
Q3
R33
D6 D5
C9
D7
R72
R77
R73
U2
R74
R96
R71
R79
R70
R88
R87
R80
R94
C33
D20
R78
R91
R95
R30 C21
C2
C1
R4A
Q1A
C8
C13
R64
R65
C10
R22
R24 C14
R8
R93
R97
X2
C27
C28 R92
R85
R84
SW1
DVSS
R61
WAKE
R76 R75
D31
R15
SW2
C32 M11
R18
C23
TP6
R63
JP4
C19
Q4
J4
R57
D23
C20 U4
R27
E1
F1
D27 D24
R56
Board Mod
1 2 3 4
A
V
S
S
TP5
R34
RESET
R51
R69
R81
R68
R82
R67
R83
J3
U6
J6
Figure 2a Top PCB Layout
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CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Figure 2b Bottom PCB Layout
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CMX878 Reference Design and Demonstration Board
6.
Detailed Description
6.1
Hardware Description
DE8781/DE8782
The DAA, power supply and ring detect circuitry on the DE878x board is based on that described
in the CMX878 datasheet. Most of the discrete semiconductors called from the CMX878
datasheet have been replaced with SMT equivalents. The DE8781 board is supplied with
components fitted for North American use and the DE8782 board is supplied with components
fitted for European use.
6.1.1
Power supply options and Operating Voltage
Jumpers JP1 and JP2 select the power supply options for the DE878x. This table summarises
the options:JP1
2->3
1->2
1->2
JP2
1->2
1->2
2->3
Power Source
Line
VLCL
VLCL
AVDD
3.3Volts
3.3Volts
2.7 -> 5.5 Volts
Comments
Default, VLCL not connected
VLCL = 9Volts nominal
VLCL = AVDD = 5.5Volts max.
Any power supply connected to VLCL should be isolated. Most laboratory power supplies or
‘power bricks’ are suitable. A 9Volt battery is an alternative option.
Whenever the CMX878 is placed in standby mode the main regulator is disabled. This removes
power from most of the CMX878 and all external circuitry including the µController. Only an inactive to active transition at DTRN or two ringing bursts (default configuration) will bring the
CMX878 out of standby and hence restore power to the µController. It is the task of the
µController start-up code to establish what is happening and act accordingly.
A shorting link across connector J3, pins 15 and 16, (default) ensures that the DE878x goes into
standby mode when a call is cleared. Removing the link allows the DE878x to remain operating,
in AT command mode, when there is not a call in progress. Users should note that this is an
engineering mode which is not compliant with network connectivity standards such as FCC part
68 and TBR21.
6.1.2
ADC input and line voltage monitoring
The CMX878 device and reference circuit, see CMX878 datasheet for details, provides a
method to determine the dc voltage on the telephone line. The DE878x hardware differs from
the CMX878 datasheet in that separate transistors are used to enable the ADC input path and the
regulator. This is necessary in order to provide the power supply options detailed above. The
reference designators for the extra components are suffixed with a letter A.
6.1.3
Opto-couplers power supply
The opto-couplers on the PC side of the RS232 interface are powered by current drawn from the
pins of the RS232 interface. DVDD provides power to the opto-couplers on the side of the
µController.
6.1.4
Expansion
6.2
Connector J3, pins 1 to 14 are provided for user expansion. Un-used I/O lines of the µController,
DVDD and DVSS are taken to this header. The total external load on DVDD should not exceed
7mA.
Firmware Description
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CMX878 Reference Design and Demonstration Board
DE8781/DE8782
The PIC16LF876-04/SP µController fitted on the DE878x demonstration board has been
programmed by CML before shipment with the latest version of firmware. Please read the
separate information sheet (EK8780) and check the CML web site for firmware status. The latest
source code and programming file (EF8780nn.HEX, where ‘nn’ represents the version number)
can be downloaded from the CML web site.
The serial communications firmware supplied in the PIC µController assumes the following
configuration: 8 data bits, no parity, 1 stop bit and 4,800 baud with hardware flow control.
6.2.1
Start up
The flow chart on the next page shows the main tasks of program execution from start-up.
If the jumper between connector J3 pins 15 and 16 is removed, the message EF8781 Vn.n or
EF8782 Vn.n, will be displayed in the terminal emulator window when these tasks have been
completed.
6.2.2
Operation
The DE878x firmware only supports DTMF dialling.
AT command echoing is an option available in the firmware and involves echoing the received
characters sent by the PC. The firmware also provides the option of sending result codes to the
PC. These responses can be in either an alpha or numeric form.
The AT command set for the DE878x is tabulated in the following pages. These commands can
be entered on a PC running Windows terminal emulator software, such as the ‘HyperTerminal’
program supplied with Windows 95/98/NT systems.
The ‘HyperTerminal’ Send Text File facility is useful for data transfer i.e. when the DE878x has
established a connection with a remote modem. This terminal emulator facility can also be used
for sending AT command scripts to the DE878x. These scripts should consist of a single line
multiple AT command, for example.
[email protected][email protected][email protected]=4567<CR>
6.2.3
Caller ID
If register S15, bit 0 is set, a basic caller ID recovery function is enabled. It is limited to caller ID
messages that are present between the first and second ring bursts of an incoming call alert, as
is the case in the U.S. or ETSI 300-659.1 section 6.1.1. The message contents are sent to the
host PC across the serial RS232 connection. A number of caller ID options are available by
writing to register S15 with:
• Bit 1 = ‘1’, V.23 FSK is assumed to be received or Bit 1 = ‘0’, Bell 202 FSK is assumed to
be received.
• Bit 2 = ‘1’, the message is sent to the PC unedited or Bit 2 = ‘0’, the message’s header
and length bytes are omitted and carriage returns are inserted between parameters, if
multi data message format (MDMF) messages are received.
• Bit 3 = ‘1’, the CMX878 will automatically answer an incoming call if the received caller
ID message contains a calling line identity parameter which matches the stored number.
The stored number can be entered using the [email protected] command, see section “CML
Specific DE878x AT Commands”. This function will only work when MDMF caller ID
messages are received.
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6.2.4
DE8781/DE8782
Line in Use and Parallel phone detect
If register S14, bit 6 is set, then, the CMX878 ADC function is used to monitor the line’s DC
voltage. If this voltage drops suddenly during dialling, handshaking or data transfer, it is
assumed to be due to another extension requiring the phone line. This will cause the CMX878 to
go on hook, the firmware will send the NO CARRIER result code to the PC and if connector J3,
pins 15 and 16 are shorted (default), power down. The firmware also checks the line’s DC
voltage before originating a call, if it is low it is assumed the line is in use and the call attempt is
aborted and the BUSY result code is sent to the PC.
6.2.5
CMX878 Supplementary Standby Register
This register inside the CMX878 is used to maintain status information relating to the current
operating mode of the DE878x. The information is used if the DE878x is recovering from a break
in line power. In normal operation the contents of the register are periodically updated.
6.2.6
Standards Testing
During standards testing it is necessary to transmit constant signals such as DTMF digits and
sequences of bytes. The way to do this is to use the CML specific AT commands:
•
•
•
[email protected] - Transmits DTMF tones
[email protected] - Transmits random bytes in the high band
[email protected] - Transmits random bytes in the low band
See section “CML Specific DE878x AT Commands” for more detail.
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DE8781/DE8782
Start
Initialise Micro core, I/O and 'C-Bus'
No
CMX878
standby supply
register contents
VALID?
Initialise DE8781 application
from defaults.
Yes
Get previous modem and line status
from CMX878 supplementary standby register
Check CMX878 event flags
and action.
No
Return
to standby
mode?
Yes
Step through main loop tasks
i.e. interpret AT commands
Return
to standby
mode?
Save status information in
CMX878 supplementary standby register.
No
Go to standby mode
Yes
End
Figure 3 Program Flow
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CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Basic DE878x AT Commands
Command
Description
A
Answer Command
The modem will go off-hook and attempt to establish a connection with a remote
modem.
Syntax: ATA<CR>
A/
Re-Execute Previous Command Line
Re-executes the last issued command line. This command does not require the AT
prefix or a carriage return.
Syntax: A/
Bn
Select Communications Standard
Selects the communications standard specified by the parameter n.
Syntax: ATBn<CR>
Modifier Usage
n=0 Selects ITU-T V.22bis at 2400bps QAM (default).
n=1 Selects ITU-T V.22 at 1200bps DPSK.
n=2 Selects ITU-T V.23 with Tx 75bps and Rx 1200bps FSK.
n=3 Selects ITU-T V.23 with Tx 1200bps and Rx 75bps FSK.
n=4 Selects ITU-T V.22 at 600bps DPSK.
n=5 Selects ITU-T V.21 at 300bps FSK.
n=6 Selects Bell 212A at 1200bps DPSK.
n=7 Selects Bell 202 with Tx 150bps and Rx 1200bps FSK.
n=8 Selects Bell 202 with Tx 1200bps and Rx 150bps FSK.
n=9 Selects Bell 103 at 300bps FSK.
Dn
Dial Command
This command directs the modem to go off-hook, dials according to the string
entered and attempts to establish a connection with a remote modem. The n
represents an ASCII string composed of dial digits and dial modifiers and must not
exceed the 15 character buffer limit. The DTMF tone dialling digits include 0
through 9, A, B, C, D, and the symbols # and *.
For example: ATD9,01621875500<CR>
Modifier Usage
n=L Re-dial last number.
n=,
Delay dial sequence (pause setting contained in S-Register S8).
En
Echo Command Characters
Syntax: ATEn<CR>
Modifier Usage
n=0 Disables the echoing of commands to the screen.
n=1 Enables echoing of commands to the screen (default).
Command
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CMX878 Reference Design and Demonstration Board
Hn
DE8781/DE8782
Switch Hook Control
Syntax: ATHn<CR>
Modifier Usage
n=0 Instructs the modem to go on-hook (disconnect).
n=1 Instructs the modem to go off-hook.
In
Identification
Requests the modem to return its product identification information.
Syntax: ATIn<CR>
Modifier Usage
n=0 Displays the firmware name and version number.
n=1 Displays CML Microcircuits sales information.
Nn
Modulation Fallback Option
Syntax: ATNn<CR>
Modifier Usage
n=0 When originating or answering, modem negotiates only at the specified
communications standard (default).
n=1 When originating or answering, falls back from V.22bis to V.22 as required.
O
Return to Data Transfer Mode
Used during on-line AT command mode, this command allows the user to return to
data transfer mode. Note, this command does not initiate any retrain sequence.
Syntax: ATO<CR>
Sn?
S-Register Read
Command for displaying the contents of an S-Register (See S-Register Table).
Syntax: ATSn?<CR>
Sn=x
where n is the S-Register to be interrogated (decimal).
Value returned is either in hex (default) or decimal format depending on the setting
of Bit 4 in the S14 register.
S-Register Write
Command for writing to an S-Register (See S-Register Table).
Syntax: ATSn=x<CR>
where n is the S-Register (decimal) and x is the value to be written (decimal, 0255).
 2003 CML Microsystems plc
17
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Command
Description
Zn
Modem Reset
Instructs the modem to reload the factory S-Register settings (See S-Register
Table).
Syntax: ATZn<CR>
Modifier Usage
n=0 Restore factory profile 0, clear last number dialled store.
CML Specific DE878x AT Commands
Command
Description
“R
Manual Retrain
Will cause the modem to initiate a retrain to synchronise with the remote modem.
For use only during data transfer using V.22bis.
Syntax: AT“R<CR>
@A
Store Caller Line ID Number
Allows entry of the number to be used for the calling line ID automatic answer
function. The maximum length of the entered number is 20 digits, as per ETSI
300-659.1.
Syntax: [email protected].n<CR>
Modifier Usage
nn..n = The string of digits for comparison.
@D
DTMF Tone Transmit
CMX878 will constantly transmit a selected DTMF tone dialling digit. Can only be
selected with connector J3, pins 15 and 16, open circuit.
Syntax: [email protected]<CR>nn..nX
Modifier Usage
n = 0-9, A, B, C, D, * or # The DTMF tone dialling digit to be transmitted.
X = any other key Terminates the function.
 2003 CML Microsystems plc
18
UM8780/3
CMX878 Reference Design and Demonstration Board
Command
@Fn
DE8781/DE8782
Description
Test Functions
Can only be selected with connector J3, pins 15 and 16, open circuit.
Syntax: [email protected]<CR>
Modifier Usage
n=0 Reserved.
n=1 Reserved.
n=2 Delay 100ms.
n=3 Delay 1s.
n=4 Reserved.
n=5 Reserved.
n=6 CMX878 Monitor Function 1. Continuously reads and displays the contents of
the Status register. The update rate is based on the S19 register setting. The
function may be aborted by pushing any key.
n=7 CMX878 Monitor Function 2. Reads and displays the contents of the Status
register when an interrupt occurs. Error message returned after 30 seconds if
IRQN does not go low. User must enable IRQN output and set the appropriate IRQ
Mask bit before executing this test command.
n=8 CMX878 Monitor Function 3. Continuously reads and displays the contents of
the Status register followed by the Event register. The update rate is based on the
S19 register setting. The function may be aborted by pushing any key.
n=9 Returns 8bit value representing the dc voltage at the ADC input to the
CMX878.
n=A CMX878 Monitor Function 4. Continuously returns 8bit value representing the
dc voltage at the ADC input to the CMX878. The update rate is based on the S19
register setting. The function may be aborted by pushing any key.
n=B CMX878 Transmit Function 1. Continuously transmits a random sequence of
bytes in the high band. S27 and S25 specify the protocol and transmit settings
used, respectively. The function my be aborted by pushing any key.
n=C CMX878 Transmit Function 2. Continuously transmits a random sequence of
bytes in the low band. S27 and S25 specify the protocol and transmit settings
used, respectively. The function my be aborted by pushing any key.
 2003 CML Microsystems plc
19
UM8780/3
CMX878 Reference Design and Demonstration Board
Command
@R01
DE8781/DE8782
Description
CMX878 Device Reset
Sends the General Reset Command to the CMX878 device.
Syntax: [email protected]<CR>
@Rn?
CMX878 Register Read
Command for displaying the contents of a CMX878 device register
Syntax: [email protected]?<CR>
where n is a valid CMX878 register address (hexadecimal).
Value returned is either in hex (default) or decimal format depending on the setting
of Bit 4 in the S14 register.
@Rn=x
CMX878 Register Write
Command for writing to a CMX878 device register.
Syntax: [email protected]=x<CR>
where n is a valid CMX878 register address (hexadecimal) and x is the value to be
written in hex (default) or decimal format depending on the setting of Bit 4 in the
S14 register.
8-bit register values should be between 0-FF, whilst 16-bit register values should
be between 0-FFFF.
S-Registers
The following table gives a brief description of the available S-registers and their functions. Register
range, units and factory profiles are also listed. These values are stored in non-volatile memory.
Reg
Range
Units
Description
Factory
Profile
S0
0-255
Rings
Automatic answer - Number of rings until
automatic answer. If the register is zero the
modem will not automatically answer.
2
S1
0-255
Rings
Count incoming rings - This register is read
only and contains the number of rings detected by
the modem.
0
S2
0-127
ASCII
Decimal
Escape character value - This register defines
an ASCII decimal value of the escape character.
The default setting is an ASCII + and the escape
sequence is +++. A value over 127 disables the
escape sequence.
43
 2003 CML Microsystems plc
20
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Reg
Range
Units
Description
Factory
Profile
S3
0-127
ASCII
Decimal
Carriage return character - Contains the ASCII
decimal value of the character recognised as the
command line terminator. This character will also
be sent at the end of result codes.
13
S4
0-127
ASCII
Decimal
Line feed character - Contains the ASCII
decimal value of the character recognised by the
modem as the line feed. The modem sends the
line feed character after a carriage return only
when word responses are sent.
10
S5
0-127
ASCII
Decimal
Backspace character - Contains the ASCII
decimal value of the character recognised as a
backspace.
8
S6
2-255
s
Wait time for blind dialling - Sets the length of
time to pause after the modem goes off the hook
before the modem dials the first digit of the
telephone number.
2
S7
1-255
s
Wait for carrier after dial - Sets the length of
time the modem waits for a carrier before
returning on-hook.
50
S8
0-255
s
2
S9
S10
1-255
1-255
100ms
100ms
Pause Time for Comma Dial Modifier Specifies the number of seconds to pause for
each comma (,) encountered in a dial string.
Reserved
Lost carrier to hang up delay - Sets the length
of time that the modem waits before hanging up
after the loss of a carrier. This allows the modem
to distinguish between disturbances that
momentarily break the connection and the remote
modem hanging up.
S11
5-25
10ms
DTMF tone duration - Defines the duration of
DTMF tones for tone dialling. The length of
pause between each DTMF tone is the same as
this duration time.
10
S12
0-255
50ms
Escape code guard time - Specifies the
minimum time before entry of the escape
sequence.
This value also dictates the
acceptable entry speed (inter-character time) for
each escape character.
20
S13
0-255
Decimal
Reserved
0
 2003 CML Microsystems plc
21
6
7
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Reg
Range
Units
Description
Factory
Profile
S14
0-255
Decimal
155
S15
0-255
Decimal
S16
S17
S18
0-255
0-255
0-255
Decimal
Decimal
s
General options - provides the following
functions:
Bit 0 – Send state of CMX878 event register on
power-up, 1 enabled, 0 disabled.
Bit 1 - Echo command character, 0 Disables
echoing (ATE0), 1 Enables echoing (ATE1)
Bit 2 - Result code display, 0 Send responses, 1
Do not send responses
Bit 3 - Word or number responses, 0 Send
number responses, 1 Send word responses
Bit 4 – Data format for read or write of CMX878
registers and read of S-registers, 0 Decimal, 1
Hex
Bit 5 – Reserved.
Bit 6 – Drop call on parallel phone detect, 1
enabled, 0 disabled.
Bit 7 - Answer/originate operation, 0 Answer
(ATA), 1 Originate (ATD)
Caller ID Options – provides the following
functions:
Bit 0 – Caller ID reception, 1 enabled, 0 disabled.
Bit 1 – FSK protocol, 1 V.23 FSK, 0 Bell 202
FSK.
Bit 2 – Output format, 1 Message header bytes
forwarded, 0 Message header bytes not
forwarded.
Bit 3 – Calling line ID Automatic answer, 1
enabled, 0 disabled.
Bit 4,5,6,7 – Reserved.
Reserved
Reserved
General Purpose Timer - Used for various
firmware functions.
S19
0-255
10ms
S20
S21
S22
S23
0-255
0-255
0-255
0-255
Decimal
Decimal
Decimal
Decimal
 2003 CML Microsystems plc
General Purpose Timer – Used for various
firmware functions
Reserved
Reserved
Reserved
Bit Mapped register - Provides the following
functions:
Bit 0, 1, 2, 3, 4, 5 - Reserved
Bit 6, 7 - Guard Tones (DPSK/QAM high band
operation only), 00 None,11 550Hz, 10 1800Hz
22
0
2
0
30
2
0
193
0
0
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Reg
Range
Units
Description
Factory
Profile
S24
0-255
Decimal
Bit Mapped register - Provides the following
functions:
Bit 0 - CMX878 Xtal Freq, 0 12.2880MHz, 1
11.0592MHz
Bit 1 - CMX878 Tx and Rx Fixed Compromise
Equalisers (used during negotiation and data
transfer), 0 Enable, 1 Disable
Bit 2 - CMX878 Auto Equaliser (DPSK operating
modes, always enabled during V22bis QAM
operation), 0 Disable, 1 Enable
Bit 3, 4, 5, 6, 7 – Reserved
1
S25
0-255
Decimal
Bit Mapped register - Provides the following
functions:
Bit 0, 1, 2 - CMX878 Tx Gain (used during
negotiation and data transfer), 111 0dB, 110 1.5dB, 101 -3.0dB, 100 -4.5dB, 011 -6dB, 010
-7.5dB, 001 -9.0dB, 000 -10.5dB
Bit 3, 4, 5 - CMX878 Tx Data/Stop bits (used
during data transfer), 111 8/2 bits, 110 8/1
bits, 101 7/2 bits, 100 7/1 bits, 011 6/2 bits,
010 6/1 bits, 001 5/2 bits, 000 5/1 bits
Bit 6, 7 - CMX878 Tx Start-stop mode (used
during data transfer), 00 Odd parity, 01 Even
parity, 10 No parity
183
S26
0-255
Decimal
Bit Mapped register - Provides the following
functions:
Bit 0, 1, 2 - CMX878 Rx Gain (used during
negotiation, data transfer and Caller Line ID),
111 0dB, 110 -1.5dB, 101 -3.0dB, 100 -4.5dB,
011 -6dB, 010 -7.5dB, 001 -9.0dB, 000 10.5dB
Bit 3, 4, 5 - CMX878 Rx Data and Parity bits
(used during data transfer), 111 8 data +
parity, 110 8 data, 101 7 data + parity, 100 7
data, 011 6 data + parity, 010 6 data, 001 5
data + parity, 000 5 data
Bit 6, 7 - CMX878 Rx USART (used during data
transfer), 00 2.3% overspeed, 01 1%
overspeed, 10 No overspeed
55
 2003 CML Microsystems plc
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UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
Reg
Range
Units
Description
Factory
Profile
S27
0-255
Decimal
Bit Mapped register - Provides the following
functions:
Bit 0, 1, 2, 3 - Reserved.
Bit 4, 5, 6, 7 - Communication Standard, 0000
(ATB0), 0001 (ATB1), 0010 (ATB2), 0011
(ATB3), 0100 (ATB4), 0101 (ATB5), 0110
(ATB6), 0111 (ATB7), 1000 (ATB8), 1001
(ATB9)
0
S28
S29
0-255
0-255
Decimal
Decimal
Reserved
Reserved
0
0
Modem Result Codes
Numeric Response (Decimal)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
17
 2003 CML Microsystems plc
Alpha Response
OK
CONNECT
RING
NO CARRIER
ERROR
NO DIAL TONE
BUSY
CONNECT 2400
CONNECT 1200
CONNECT 600
CONNECT 300
CONNECT 1200/75
CONNECT 75/1200
CONNECT 1200/150
CONNECT 150/1200
NYI
RETRAINING
24
(Not Yet Implemented)
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
AT Command Summary
1. The maximum command length is 48 characters, excluding the AT prefix and carriage return.
2. A user defined escape sequence (usually +++) is required to revert the modem from on-line (data
transfer mode) to the command mode, to allow the user to issue AT commands to the PIC.
3. Every command except for A/ and the escape sequence must begin with the AT prefix and be
entered by pressing a carriage return.
4. When the default command echoing and word result codes are enabled the firmware will send a LF
character directly after a CR character to ensure the terminal emulator display is legible.
5. Commands which are not fully implemented will return the result code ‘NYI’ (Not Yet Implemented).
6. Do not send AT commands to the Demonstration board until the previous result code (if enabled) has
been received.
 2003 CML Microsystems plc
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UM8780/3
CMX878 Reference Design and Demonstration Board
6.3
Software Description
6.3.1
Terminal Emulator
DE8781/DE8782
Users will need to run a suitable terminal emulator on their PC in order to communicate with the
PIC µController on the DE878x. ‘HyperTerminal’, which is supplied with the Windows 95/NT
installations, is suitable for this purpose.
HyperTerminal Setup
Emulation VT100
ASCII Character set
ASCII Receiving:
COM Port Settings:
Wrap lines that exceed terminal width.
Bits per second
Data bits
Parity
Stop bits
Flow Control
6.3.2
4,800
8
None
1
Hardware
In-Circuit Programming
Connector J6 provides the connections to the PIC µController which are required to reprogram
the device. These connections need to be made to 28 pin DIL header, which can be plugged in to
a proprietary programming tool such as the Microchip PICStart plus programmer. The pin
mapping is as follows.
DE878x pin
J6 pin 1
J6 pin 2
J6 pin 3
J6 pin 4
J6 pin 5
Program mode signal name
(µC normal pin name)
MCLR (MCLR)
Data (RB7, CTSN)
Clock (RB6, TXD)
Open circuit
i.e. do not connect
Vss (Vss)
28 pin DIL (µC) pin no.
1
28
27
N/A
19
Use of this feature is as follows.
• Disconnect DE878x from telephone line, RS232 and any power supply at VLCL.
• Set jumpers JP1 and JP2 such that the DE878x regulator is not used and AVDD is supplied
directly from VLCL i.e:JP1 pins 1 and 2 shorted, pin 3 open.
JP2 pin 1 open, pins 2 and 3 shorted.
• Connect an external power source set to 5 Volts dc across VLCL and AVSS ( connector, J2 ).
• Set programming tool in accordance with manufacturers instructions.
• Connect DE878x to programming tool as per above table.
• Switch on external 5 Volts power source.
• Start programming sequence in accordance with programming tool manufacturers
instructions.
 2003 CML Microsystems plc
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UM8780/3
CMX878 Reference Design and Demonstration Board
6.4
Additional Information
6.4.1
AT Command Text Files
DE8781/DE8782
To allow evaluation tests to be quickly and easily repeated it may be useful to create text files
containing single line multiple AT commands. Commands can be transferred to the PIC
µController via the ‘HyperTerminal’ send text file facility. Note, multiple text files may be required
to perform a test if any command lines exceed 48 characters.
6.4.2
Sending Text Files using ‘HyperTerminal’
The following is a description of how to send text files to the DE878x using ‘HyperTerminal’.
a) Select the Transfer menu
b) Select Send Text File
c) Select the required file from the Send Text File window
 2003 CML Microsystems plc
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UM8780/3
CMX878 Reference Design and Demonstration Board
6.4.3
DE8781/DE8782
Negotiation and Data Transfer
Modem negotiation (handshaking) may be aborted by pushing any key prior to entering data
transfer mode.
During data transfer mode the user can revert to on-line AT command mode by typing the
escape code sequence (+++). The escape code guard time (based on S12) must have expired
to successfully access this mode. Whilst in on-line AT command mode the board to remote
modem connection may be aborted by typing ATH0 (instructs modem to go on-hook).
Alternatively the user can enter relevant AT commands or return to data transfer mode by using
the ATO command.
The firmware only supports asynchronous data transfer.
Receiver USART overspeed settings specified in S-Register, S26, only apply to DPSK/QAM
operating modes.
Transmitter Guard Tone settings specified in S-Register, S23, only apply to DPSK/QAM
answering modes.
If the carrier is lost (during data transfer) or negotiation is aborted by the user, the firmware will
send the General Reset Command to the CMX878 device. This action will cause the DE878x
demonstration board to hang up and power down.
The data transfer firmware contains basic retrain code active only when communicating using
V.22bis. This process is sometimes performed by modems when signal distortion or line noise is
detected which may threaten data integrity. The data transfer firmware can detect when a
remote modem initiates a retrain and responds accordingly, returning the RETRAINING result
code to the PC. Although the firmware will not automatically initiate a retrain, a manual retrain
can be performed by reverting to the on-line AT command mode and entering the AT”R
command. If a retrain is successful the CONNECT 2400 result code is returned to the PC and
data transfer is resumed, otherwise the NO CARRIER result code is returned and the
microcontroller reverts to AT command mode.
The receive auto equaliser function can be enabled via the S24 register. This S24 register
setting only applies to DPSK modes of operation. The CMX878 firmware for V22bis always
enables the receive auto equaliser half way through the negotiation phase.
6.4.4
Example AT Commands for Reference Modem (not supplied) Setup
The DE878x should be able to establish and maintain a communications link with any modem
designed for use on the PSTN, provided that it supports the appropriate V.xx protocols. The
command structure for a chosen reference is likely to be similar, but not identical, to that of the
DE878x. Users should consult the modem instructions in order to configure it correctly. As an
example these are command strings used for a Hayes Optima 336 Modem.
V.22bis Protocol - AT&FB30X1Q0E1V1L0N0W2S37=6S95=42
V.22 Protocol - AT&FB0X1Q0E1V1L0N0W2S37=5S95=42
 2003 CML Microsystems plc
28
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
6.5
Example Modem Tests
NOTE: The DE878x must be powered-up in order for it to be controlled via the AT command set.
An in-active to active transition at DTRN will achieve this.
6.5.1
Set up DE878x to Automatically Answer a V.22 Call from a Remote Modem
1. Select V.22 communication standard (default is V.22bis).
Command : ATB1<CR>
2. Select the required Guard Tone setting using the AT&Gn command (default is none).
3. Enable/Disable Fixed Compromise Equalisers by writing to S-Register, S24 (default is
enabled).
4. Configure CMX878 Transmitter by writing to S-Register, S25.
5. Configure CMX878 Receiver by writing to S-Register, S26.
6. Set Automatic Answer S-Register (S0) to 2 rings.
Command : ATS0=2<CR>
7. Set DE878x on-hook and power down.
Command : ATH0<CR>
The DE878x will wake up and attempt to establish a V.22 connection when 2 rings (BT or Bell)
have been successfully detected. The CONNECT 1200 result code will be returned to the PC if a
V.22 connection is successfully established. The NO CARRIER result code will be returned to the
PC if the DE878x fails to establish a V.22 connection within the time specified in S-Register,
S18.
6.5.2
Set up DE878x to Manually Answer V.23 Call from a Remote Modem
1. Select V.23 communication standard (default is V.22bis).
Command : ATB2<CR>
2. Enable/Disable Fixed Compromise Equalisers by writing to S-Register, S24 (default is
enabled).
3. Configure CMX878 Transmitter by writing to S-Register, S25
4. Configure CMX878 Receiver by writing to S-Register, S26.
5. Manually Answer V.23 Call.
Command : ATA<CR>
The DE878x will attempt to establish a V.23 connection. The CONNECT 1200/75 result code will
be returned to the PC if a V.23 connection is successfully established. The NO CARRIER result
code will be returned to the PC if the DE878x fails to establish a V.23 connection within the time
specified in S-Register, S18.
 2003 CML Microsystems plc
29
UM8780/3
CMX878 Reference Design and Demonstration Board
6.5.3
DE8781/DE8782
Set up DE878x to Originate V.22bis Call to a Remote Modem
Configure DE878x to dial out using a blind dialling method with DTMF tone duration of 150ms.
1. Select V.22bis communication standard (default is V.22bis).
Command : ATB0<CR>
2. Set Wait Time for Blind dialling S-Register (S6) to 5 seconds.
Command : ATS6=5<CR>
3. Set DTMF Tone Duration S-Register (S11) to 150ms.
Command : ATS11=15<CR>
4. Enable/Disable Fixed Compromise Equalisers by writing to S-Register, S24 (default is
enabled).
5. Configure CMX878 Transmitter by writing to S-Register, S25.
6. Configure CMX878 Receiver by writing to S-Register, S26.
7. DTMF Dial (example number 0165447887).
Command : ATD0165447887<CR>
The DE878x will go off-hook and blind dial after 5 seconds. After dialling the DE878x will
attempt to establish a V.22bis connection. The CONNECT 2400 result code will be returned to
the PC if a V.22bis connection is successfully established. The NO CARRIER result code will be
returned to the PC if the DE878x fails to establish a V.22bis connection within the time specified
in S-Register, S7.
6.5.4
Troubleshooting
Some terminal emulators have been found not to support full hardware flow control when
transferring text files. This could result in data loss when using this facility. If this problem is
experienced users should try using a different terminal emulator
To ensure successful negotiation and data transfer between the DE878x and third party modems,
users should ensure their third party modem is configured to the correct protocol (see third party
AT command documentation).
Note, any sudden loss of the 2-wire line during data transfer will result in loss of carrier and
therefore the demonstration board will hang up and display the NO CARRIER message.
However, due to the lost carrier to hang up delay (S10), a short burst of corrupt characters (noise
generated) will be observed on the HyperTerminal window before the NO CARRIER message is
displayed. These corrupt characters can sometimes match control characters and therefore
modify HyperTerminal’s behaviour. The user is advised to restart HyperTerminal if this happens.
 2003 CML Microsystems plc
30
UM8780/3
CMX878 Reference Design and Demonstration Board
7.
Performance Specification
7.1
Electrical Performance
DE8781/DE8782
7.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the Evaluation Kit.
Supply (VTIP – VRING)
Supply (VLCL – VSS)
Supply AVDD (VLCL ) – VSS
Voltage on any connector pin to VSS
Current into or out of VLCL and VSS pins
Current into or out of any other connector pin
Storage Temperature
Operating Temperature
Notes
1
1
2
Min.
-300
-0.3
-0.3
-0.3
0
-20
-10
+10
Max.
300.0
300.0
6.2
DVDD + 0.3
+0.5
+20
+70
+35
Units
V
V
V
V
A
mA
°C
°C
Max.
52.0
5.5
+35
Units
V
V
°C
7.1.2 Operating Limits
Correct operation of the Evaluation Kit outside these limits is not implied.
Supply (VLCL - VSS)
Supply AVDD (VLCL ) – VSS
Operating Temperature
Notes
1
1
Min.
6.0
2.7
+10
Notes:
1. Dependant on jumper selection, VLCL feeds the DE878x regulator or VLCL = AVDD . There
are different maximum and operating limits for each case.
2. Not included line connection, J1.
7.1.3
Operating Characteristics
Details in this section represent design target values and are not currently guaranteed.
For the following conditions unless otherwise specified:
Evaluation Device Xtal Frequency = 11.0592MHz ±0.01% (100ppm), Tamb = +25°C.
Notes
DC Parameters
IDD (standby)
IDD (idle)
Notes: 1.
2.
3.
1
1,2
Min.
Typ.
Max.
Units
µA
mA
7.0
3.0
Current drawn from line or VLCL.
CMX878 regulator on, PIC active On-hook, DTRN active.
Off-hook the DE878x will draw all the current provided by the loop, i.e. if the loop
current is 40mA then IDD will be 40mA.
 2003 CML Microsystems plc
31
UM8780/3
CMX878 Reference Design and Demonstration Board
DE8781/DE8782
CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent licences are implied.
CML reserves the right at any time without notice to change the said circuitry and any part of this product specification. Evaluation
kits and demonstration boards are supplied for the sole purpose of demonstrating the operation of CML products and are supplied
without warranty. They are intended for use in a laboratory environment only and are not for re-sale, end-use or incorporation into
other equipments. Operation of these kits and boards outside a laboratory environment is not permitted within the European
Community. All software/firmware is supplied "as is" and is without warranty. It forms part of the product supplied and is licensed
for use only with this product, for the purpose of demonstrating the operation of CML products. Whilst all reasonable efforts are
made to ensure that software/firmware contained in this product is virus free, CML accepts no responsibility whatsoever for any
contamination which results from using this product and the onus for checking that the software/firmware is virus free is placed on
the purchaser of this evaluation kit or development board.
www.cmlmicro.com
For FAQs see: www.cmlmicro.com/products/faqs/
For a full data sheet listing see: www.cmlmicro.com/products/datasheets/download.htm
For detailed application notes: www.cmlmicro.com/products/applications/
Oval Park, Langford, Maldon,
Essex,
CM9 6WG - England.
4800 Bethania Station Road,
Winston-Salem,
NC 27105 - USA.
No 2 Kallang Pudding Road,
#09 to 05/06 Mactech
Industrial Building,
Singapore 349307
No. 218, Tian Mu Road
West, Tower 1, Unit 1008,
Shanghai Kerry Everbright
City, Zhabei,
Shanghai 200070,
China.
Tel: +44 (0)1621 875500
Tel: +65 6745 0426
Fax: +44 (0)1621 875600
Tel: +1 336 744 5050,
800 638 5577
Fax: +1 336 744 5054
Fax: +65 6745 2917
Tel: +86 21 6317 4107
+86 21 6317 8916
Fax: +86 21 6317 0243
Sales:
[email protected]
Sales:
[email protected]
Sales:
[email protected]
Sales:
[email protected]
Technical Support:
[email protected]
Technical Support:
[email protected]
Technical Support:
[email protected]
Technical Support:
[email protected]